Does that happen with ALL files or only one?
If it’s only one, seems like the file has no index, usually due to a broken file (incomplete for instance)
In this case take your SD Card or USB drive to your PC and try to play the file.
You have to try file that fails, not the original file your copied from which is probably already on your PC and may work because it hasn’t been (badly) copied.
If it’s ALL files, you may try another media.
-eric